[bug report] staging: wilc1000: added support to dynamically add/remove interfaces

[dan.carpenter@oracle.com (Dan Carpenter)]

Hello Ajay Singh,

The patch 9bc061e88054: "staging: wilc1000: added support to
dynamically add/remove interfaces" from Jun 26, 2019, leads to the
following static checker warning:

	drivers/staging/wilc1000/wilc_wlan.c:497 wilc_wlan_handle_txq()
	warn: missing error code here? 'wilc_wlan_txq_get_first()' failed.

drivers/staging/wilc1000/wilc_wlan.c
   474  int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
   475  {
   476          int i, entries = 0;
   477          u32 sum;
   478          u32 reg;
   479          u32 offset = 0;
   480          int vmm_sz = 0;
   481          struct txq_entry_t *tqe;
   482          int ret = 0;
                    ^^^^^^^

   483          int counter;
   484          int timeout;
   485          u32 vmm_table[WILC_VMM_TBL_SIZE];
   486          const struct wilc_hif_func *func;
   487          u8 *txb = wilc->tx_buffer;
   488          struct net_device *dev;
   489          struct wilc_vif *vif;
   490  
   491          if (wilc->quit)
   492                  goto out;
   493  
   494          mutex_lock(&wilc->txq_add_to_head_cs);
   495          tqe = wilc_wlan_txq_get_first(wilc);
   496          if (!tqe)
   497                  goto out;
                        ^^^^^^^^
Should this really be a success path?

   498          dev = tqe->vif->ndev;
   499          wilc_wlan_txq_filter_dup_tcp_ack(dev);
   500          i = 0;
   501          sum = 0;
   502          do {
   503                  if (tqe && (i < (WILC_VMM_TBL_SIZE - 1))) {

regards,
dan carpenter